Originally Posted by
unterhausen
Supernova clearly has a voltage doubler that increases the light at higher speeds. There is a discrete increase in light and drag at a particular speed. It could be active, because there is a lot of circuitry in there. The issue with a dyno is that if you could increase the wattage put out by the hub, the rider might not appreciate it. I have seen the supernova doubler kick in while I was pedaling.
Voltage doubler circuit represents old school electronics. These days by fast switching you can do crazy things. You can load the dynamo a variable fraction of the time, get any voltage you want etc. I highly doubt they would lower themselves to any conventional textbook voltage doubler.